Outstanding Lithium Storage Performance of a Copper-Coordinated Metal-Covalent Organic Framework as Anode Material for Lithium-Ion Batteries

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外文摘要：Metal-covalent organic frameworks(MCOF)as a bridge between covalent organic framework(COF)and metal organic framework(MOF)possess the characteristics of open metal sites,structure stability,crystallinity,tunability as well as porosity,but still in its infancy.In this work,a covalent organic framework DT-COF with a keto-enamine structure synthesized from the condensation of 3,3'-dihydroxybiphenyl diamine(DHBD)and triformylphloroglucinol(TFP)was coordinated with Cu2+by a simple post-modification method to a obtain a copper-coordinated metal-covalent organic framework of Cu-DT COF.The isomerization from a keto-enamine structure of DT-COF to a enol-imine structure of Cu-DT COF is induced due to the coordination interaction of Cu2+.The structure change of Cu-DT COF induces the change of the electron distribution in the Cu-DT COF,which greatly promotes the activation and deep Li-storage behavior of the COF skeleton.As anode material for lithium-ion batteries(LIBs),Cu-DT COF exhibits greatly improved electrochemical performance,retaining the specific capacities of 760 mAh g-1 after 200 cycles and 505 mAh g-1 after 500 cycles at a current density of 0.5 A g-1.The preliminary lithium storage mechanism studies indicate that Cu2+is also involved in the lithium storage process.A possible mechanism for Cu-DT COF was proposed on the basis of FT-IR,XPS,EPR characterization and electrochemical analysis.This work enlightens a novel strategy to improve the energy storage performance of COF and promotes the application of COF and MCOF in LIBs.

外文关键词：

anode materialcopper-coordinationlithium-ion batteriesmetal-covalent organic frameworks

作者：

Derong Luo、Huizi Zhao、Feng Liu、Hai Xu、Xiaoyu Dong、Bing Ding、Hui Dou、Xiaogang Zhang

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作者单位：

Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies,College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

基金：

National Key Research and Development Project Intergovernmental International Science and Technology Innovation CooperationLeading Edge Technology of Jiangsu ProvinceLeading Edge Technology of Jiangsu ProvincePriority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)

项目编号：

2022YFE0109400BK20220009BK20202008

出版年：

2024

DOI：

10.1002/eem2.12732

能源与环境材料(英文)

ISSN：

年,卷(期)：2024.7(5)